PREDICTION MODE In prediction mode (indicated by '-z' on the command line, and sometimes called 'tz' mode), tempo calculates pulsar ephemerides over short periods of time (typically hours) in the form of a simple polynomial expansion. Such ephemerides are particularly useful for on-line folding of pulsar data while observing. Ephemerides are calculated on a day-by-day basis centered about the transit time of the pulsar at the observatory. The time spans of the polynomial series are specified by giving a 'maximum hour angle' for observations along with a maximum time span over which a single series must be valid. Multiple series within a day are calculated when necessary. The user is queried for start and end dates (MJD) for which ephemerides will be calculated. The list of pulsars for which ephemerides are to be produced is read from file 'tz.in'.